PRE-INSTALLATION
6 720 803 599 (2012/06) 9
3 PRE-INSTALLATION
3.1 CLEANING PRIMARY SYSTEMS
BEFORE CLEANING THE SYSTEM:
B Ensure that the system and pipe work is in good working order.
B Where possible keep the existing boiler/circulating pump in place
when flushing the system.
FOLLOW THE GUIDANCE OF BS7593:
Treatment of water in domestic hot water central heating and also the
flushing guidelines below.
FLUSHING THE SYSTEM
B Fill the system with cold water and check for leaks.
B Open all drain cocks and drain the system.
B Close drain cocks and add a suitable flushing agent compatible with
aluminium at the correct strength for the system conditions in
accordance with the manufacturer‘s instructions.
The pH value of the system water must be less than 8 or the
appliance guarantee will be invalidated.
B Circulate the flushing agent before the boiler is fired up.
B Run the boiler/system at normal operating temperature as directed by
the manufacturer of the flushing agent.
B Drain and thoroughly flush the system to remove the flushing agent
and debris.
B It may be necessary to use a power flushing machine to aid the
cleansing procedure in some circumstances.
B Close the drain cocks and refill with fresh water and a suitable
inhibitor.
B Vent any air from the boiler and system.
INHIBITOR
Add a suitable inhibitor or combined inhibitor/anti-freeze, if the system
is exposed to freezing conditions, to the heating system in accordance
with the DWTA code of practice and manufacturer‘s guidelines.
WATER TREATMENT
Suitable water treatment products can be obtained from the following
manufacturers:
3.2 MAINS SUPPLY
3.2.1 ELECTRICAL SUPPLY
• Supply: 230V - 50 Hz, 140 Watts
• Cable: PVC insulated 0.75 mm2 (24 x 0.2 mm) temperature rated to
90°C.
• External 3A fuse to BS1362.
• The appliance must be earthed.
• This appliance must not be connected to a three phase supply.
• IPX4D.
• Wiring must comply with the latest IEE wiring regulations.
3.2.2 GAS SUPPLY
• Boilers using Natural Gas (NG) must be connected to a governed
meter.
• Liquid Petroleum Gas (LPG) must be connected to a regulator.
• Installation and connection of the gas supply to the boiler must be in
accordance with BS6891.
• Under no circumstance should the size of the gas supply pipe be less
than 22 mm.
• The meter or regulator and pipe work to the meter must be checked,
preferably by the gas supplier. This is to ensure that the equipment is
in good working order and can meet the gas flow and pressure
requirements, in addition to the demand from any other appliance
being served.
3.2.3 WATER SUPPLY
WATER MAINS PRESSURE:
• Minimum mains water pressure: 1.5 up to 2.5 bar for maximum
performance.
• Maximum mains fed water pressure 10 bar. If necessary fit a pressure
reducing valve.
• Where the mains water supply has a non-return,
back flow prevention valve fitted, a mini expansion vessel (1) should
be connected to the mains water inlet pipe (2) between the non-
return valve (3) and the boiler (4) as shown below
NOTICE:
B All the following Pre-Installation sections must be read
and requirements met before starting boiler or flue
installations.
CAUTION:
B ISOLATE THE MAINS SUPPLIES BEFORE STARTING
ANY WORK AND OBSERVE ALL RELEVANT SAFETY
PRECAUTIONS.
NOTICE:
B Debris from the system can damage the boiler and
reduce efficiency. Failure to comply with the
guidelines for the use of water treatment with the
appliance will invalidate the appliance guarantee.
NOTICE: ARTIFICIALLY SOFTENED WATER MUST NOT
BE USED TO FILL THE CENTRAL HEATING SYSTEM.
WARNING: Sealing agents
B The addition of sealing agents to the system water is
not permitted as this can cause problems with
deposits left in the heat exchanger.
FERNOX Call 0870 601 5000 -or- www.fernox.com
SENTINEL Call 0800 389 4670 - or- www.sentinel-solutions.net
NOTICE: This is reduced to IP20 if the following
mechanical timers are fitted;
7 716 192 036 or 7 716 192 037
NOTICE: Non return, back flow prevention devices
(including those associated with water meters) fitted to
the mains water supply can cause a pressure build up
which could damage the boiler and other household
appliances.
1 Mini expansion vessel
2 Mains water inlet pipe
3Non return valve
4Boiler
1
4
32
6720643895-04.1Wo
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